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1 | /** @file |
2 | Compiler intrinsic for 32--bit unsigned division, ported from LLVM code. | |
3 | ||
4 | ||
5 | Copyright (c) 2008-2009, Apple Inc. All rights reserved. | |
6 | ||
7 | All rights reserved. This program and the accompanying materials | |
8 | are licensed and made available under the terms and conditions of the BSD License | |
9 | which accompanies this distribution. The full text of the license may be found at | |
10 | http://opensource.org/licenses/bsd-license.php | |
11 | ||
12 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, | |
13 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. | |
14 | ||
15 | **/ | |
16 | /** | |
17 | University of Illinois/NCSA | |
18 | Open Source License | |
19 | ||
20 | Copyright (c) 2003-2008 University of Illinois at Urbana-Champaign. | |
21 | All rights reserved. | |
22 | ||
23 | Developed by: | |
24 | ||
25 | LLVM Team | |
26 | ||
27 | University of Illinois at Urbana-Champaign | |
28 | ||
29 | http://llvm.org | |
30 | ||
31 | Permission is hereby granted, free of charge, to any person obtaining a copy of | |
32 | this software and associated documentation files (the "Software"), to deal with | |
33 | the Software without restriction, including without limitation the rights to | |
34 | use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies | |
35 | of the Software, and to permit persons to whom the Software is furnished to do | |
36 | so, subject to the following conditions: | |
37 | ||
38 | * Redistributions of source code must retain the above copyright notice, | |
39 | this list of conditions and the following disclaimers. | |
40 | ||
41 | * Redistributions in binary form must reproduce the above copyright notice, | |
42 | this list of conditions and the following disclaimers in the | |
43 | documentation and/or other materials provided with the distribution. | |
44 | ||
45 | * Neither the names of the LLVM Team, University of Illinois at | |
46 | Urbana-Champaign, nor the names of its contributors may be used to | |
47 | endorse or promote products derived from this Software without specific | |
48 | prior written permission. | |
49 | ||
50 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
51 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS | |
52 | FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | |
53 | CONTRIBUTORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
54 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
55 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS WITH THE | |
56 | SOFTWARE. | |
57 | **/ | |
58 | ||
59 | ||
60 | #include "Llvm_int_lib.h" | |
61 | ||
62 | UINT32 __udivsi3(UINT32 n, UINT32 d); | |
63 | ||
64 | // Returns: a / b | |
65 | ||
66 | INT32 | |
67 | __divsi3(INT32 a, INT32 b) | |
68 | { | |
69 | const int bits_in_word_m1 = (int)(sizeof(INT32) * CHAR_BIT) - 1; | |
70 | INT32 s_a = a >> bits_in_word_m1; // s_a = a < 0 ? -1 : 0 | |
71 | INT32 s_b = b >> bits_in_word_m1; // s_b = b < 0 ? -1 : 0 | |
72 | a = (a ^ s_a) - s_a; // negate if s_a == -1 | |
73 | b = (b ^ s_b) - s_b; // negate if s_b == -1 | |
74 | s_a ^= s_b; // sign of quotient | |
75 | return (__udivsi3(a, b) ^ s_a) - s_a; // negate if s_a == -1 | |
76 | } | |
77 | ||
78 |